#include<bits/stdc++.h>
using namespace std;
int main(){
    double a[10]={28.9,32.7,45.6,78,35,86.2,27.8,43,56,65};
    double b;
    for(int i=0;i<10;i++){
        int c;
        cin>>c;
        b=b+c*a[i];
    }
    cout<<b;
}